Instructions for assembly,
operation and maintenance
of indoor disconnectors
and earthing switches
with hand operated drives DK and SHA
and motor operated drives UM
single- and three-pole design
rated voltage 12, 25 and 38.5 kV
rated current 630 – 6300 A
Indoor disconnectors and earthing switches
1
Upper connection
2
Contact jaw
3
Main circuit
4
Actuator shaft
5
Stop of operating shaft
6
Pivot contact
7
Lower connection
Indoor Disconnector (630 A)
5,11 Side view
8
Contact jaw
9
Main circuit
10
Driving mechanism
11
Stop of operating shaft
12
Actuator shaft
Earthing Switch
Handling and storage
Unpack the disconnector upon arrival. Check for damages caused during the transport. Any damage should be
reported immediately to the supplier. After unpacking remove all remaining packaging material from the switching
device and accessories.
Lift the disconnector by holding it at the base frame, only. Use never the arc quenching chambers and the currentcarrying path as a component for lifting up the switching device. During the storage protect the device from
damages, humidity and dirt.
Operating conditions
The disconnector is intended for operation under normal conditions as defined by the EN 62271-1 standard, class
„minus 15, indoor use“. Highest ambient temperature: 40°C; average temperature during 24 hours is not allowed
to exceed 35 °C.
Assembly
The switching devices are designed for vertical mounting. Devices for horizontal mounting are modified and
identified accordingly.
Assembly of the disconnector
Screws are to be tightened up in a way to prevent the occurrence of deformation or stress in the disconnector
base frame (use shim blocks if needed).
Connection of busbars or cable terminals
When making connections take care of incoming terminals of the disconnector (1,7) which have to be kept away
from stresses. Fix the connecting bolts with 70 Nm torque (using another key in opposite position).
Putting the blocking system into operation
In order to reduce the probability of damage to the switching knife contacts both the disconnectors and the
earthing switches are transported in ON switching position. Consequently, the blocking system is not operative
during the transport.
Prior putting the device into operation the blocking system is to be enabled. This is done using the following steps:
1. Switch the disconnector OFF.
2. Using a torque wrench tighten special cut-in M10x25 bolt in the blocking segment with a torque of 55 Nm.
3. Check the proper function of the blocking mechanism.
2
Installation of the DK manual drive
The linkage joint of the DK lever-operated drive mechanism provides for
a vertical tilt of the drive of 45° compared to the switch disconnector shaft
position – see Figure. There is no need of stiffening the front side of the cell.
Slide the cone-type transmission on the shaft and fix it by supplied plug (the
shaft incorporates a pre-drilled pin). Pay attention to proper position of the
cone-type transmission – it determines the turning direction of the drive.
Now drill a hole into the front side of the switching cell, in accordance with the
drawing. The centre of the control part of the drive has to be in line with the
pinion of the cone-type transmission. Use shaft extension in case of need. Fix
the control part of the drive using two M10 screws with nuts (part of delivery)
and retighten slightly.
Fix the interconnecting rod length. Start from the pin hole axis on the pinion
of cone-type transmission and take the distance up to the hole axis for a pin placed on the output of control part
of the DK drive mechanism – see the figure. The pinion and the control part output are facing each other.
The total length of the connecting rod is then equal to the sum of measured length (x) plus 40 mm (i.e. l = x + 40 ).
The cut short the rod from the front side of the switching cell (the part with insulation ferrule is to be placed next to
the cone-type transmission).
Dismantle the control part of the DK drive. Put connecting rod into the gear-type transmission and secure it using
a pin. Slide the control part of the drive on the connecting rod from the front side of the cell and mark the centre of
hole on the rod for the insertion of a second pin (the marking takes place from both sides of the output of the drive
control part). Drill out a hole in the rod, for the insertion of the pin.
Set together the whole drive group. Using the pins and the cone-type transmission supplied join together the rod
and the drive control part. Retighten the control part of the drive on the cell front side.
Check the drive function by performing a few operations. Then slide on the switching state indicator (with switch
disconnector either in ON or OFF position) following the successful testing. The indicator cut out has to show the
actual switching position of the switch disconnector.
Valid for:
EK, EA, SEA switch disc.
EK/EA earth switch bellow
Valid for:
SEA earth. switch
earth. switches above
3
Assembly of the drives on the cell front
When mounting the switching device on a wall, with the SHA manual drive mechanism or the UM 20 and UM 30
motor drives (mounting place on the cell front) the switching path and switching angle have to be adjusted in
a way to let the driving shaft reach the stop block (5, 11) in both switching end positions when manipulating with
the disconnector.
The clamping handle on the disconnector shaft and that of the earthing switch have to be firmly fixed with
a torque of 90 Nm acting on the M12 screw. Re-check the torque after approx. 10 minutes. In case the lever slips
through on the shaft due to improper tightening, do not tighten up the lever on the stripped part of shaft but move
it to another, non-damaged place.
The position of clamping lever on the drive shaft, that of the control pull rods and the drive lever with gearing on
the side is shown in the following pictures. Take notice especially of the pull-rod break-through point near the
disconnector shaft and of the drive working angle. The same rules apply also for UM motor drives mounted to the
cell front.
Make the drive adjustments with disconnector in OFF position. In no way go beyond the dead point.
SHA – negative direction
Disconnector and load disconnector
OFF
ON
OFF
OFF
OFF
OFF
ON
SHA 10
SHA 11
SHA 10
ON
SHA – tracking
ON
ON
ON
SHA 30
ON
ON
OFF
SHA 31
SHA 31
4
Earthing switch
switching on from below towards the top
switching on from the top towards down
ON
ON
ON
OFF
OFF
ON
SHA 30
SHA 30
ON
ON
OFF
ON
OFF
ON
SHA 11
SHA 30
Operation test before putting the device in operation
Checking the end position of the disconnector and the earthing switch.
In the course of handling with both the manual and motor operated drive the switching shaft (4) must abut against
the end block (5). If the disconnector is equipped with earthing switch also the earthing switch shaft (12) must
reach the end positions.
Checking the current-carrying path
The knife contacts (3) must approach the fixed contact in a symmetrical way.
Checking the blocking magnets
Switching of devices equipped with blocking magnets can take place only if voltage is connected to the magnet. In
no-voltage state the switching device is blocked by magnet. The magnet is designed for 100 % of load capacity.
Connecting the blocking magnets to the power:
1
2
1
DC magnet
AC magnet with
rectifier
2
4
3
Checking the UM motor operated drives and manual emergency control
Function of the drive, its parameters and protections are described in a separate catalogue. The drive is capable
of reliable operation at voltages within the range of 85 to 110% of rated control voltage.
In case of emergency the shaft mounted drives (UM 50) can be controlled using breaking rod and handle with lug,
fixed to the disconnector shaft. When operating the device in case of emergency the connection between the
drive and the switching device becomes uncoupled automatically. The operator is thus protected from faulty
switching. If the positions of the disconnector and the drive do not correspond following the emergency operation,
the connection becomes established after the positions become aligned.
In case of emergency the cell front mounted drives (UM 20, UM 30) are operated using a crank with internal
square shaft end.
During emergency operations the switching shaft has to reach the end position for both switching positions,
and abut on the end block.
5
Circuit diagram for UM type motor operated drives – DC voltages
Circuit diagram for UM type motor operated drives – AC voltages
DC voltage
24 V
60 V
110 V
220 V
Motor overcurrent circuit breakers matching
Range
Alignment
AC voltage
6,3-10 A
9,2 A
2,5-4 A
5,6 A
110 V
1,6-2,5 A
2,1 A
230 V
0,63-1 A
0,8 A
6
Range
Alignment
2,5-4 A
1,6-2,5 A
2,6 A
2A
Checking the auxiliary switches
The adjustment of auxiliary switches takes place at the manufacturer’s, in accordance with the stipulations
of standards, and has not be changed without the consent of the suppliers. Contact terminals of auxiliary switches
are marked with numbers, depending on the sequence and type of contact:
11
Contact sequence
(chamber nr.)
Type of contact
(NC / breaking c.)
23
Contact sequence
(chamber nr.)
12
Type of contact
(NO / making c.)
24
The numbering starts always from the shaft (see the following example of contact description). The first contact is
a NC contact followed with NO contact. In such a way the contacts are alternating until the required number
of one specific type of contact runs out. The remaining contacts of one specific type are grouped at the end.
Switching devices are equipped with auxiliary switches containing always even number of contacts. Examples
of description and the arrangement of contacts:
HV (main)
contact
Auxiliary switch with 8 contacts,
3 making + 5 breaking
1st contact
NC / break.
4th contact
NO / making
Auxiliary switch with 8 contacts,
4 making + 4 breaking
Operation
The switching device operation does not require any specific knowledge, and differs according to the type
of switching device and the drive mechanism used.
The SHA drives are controlled via a control lever of l = 515 mm (for controlling the disconnector), or a lever of
l = 365 mm (for controlling the earthing switch). Drives for mounting on the side (D drive) are controlled with
a lever with hexagon.
Motor operated drives are electrically controlled using local pushbuttons, or from a central operator’s room. The
drives are fixed to the shaft of the switching device (UM 50), or operated via breaking pull rod and lever with a lug
in case of emergency. The front side cell mounted drives (UM 20, UM 30) are operated with a crank with internal
square.
Maintenance
Under normal operating conditions maintenance works are to be carried out every 10 years. During
the maintenance the following works are carried through:
Cleaning
- insulators
- insulated switching pull rod
- switching knife-type contacts (in OFF position)
- switching springs
- earthing contacts
Lubrication
- all bearings, friction lodgement and hinges (on mechanical parts of the base frame) shall be treated with oil
applied by spraying (see table below)
- surfaces of the main contacts may be greased with specified greasing agent, only, with a very thin layer
of grease applied
- after having been cleaned the earthing switch contacts are treated with grease
To be applied to
main contact surfaces
all bearings
earthing switch contacts
Lubricating means prescribed
disconnectors up to 630 A: Rivolta S.K.D. 4002 grease
disconnectors 1250A – 6300A: Barrierta L55/1 grease
Omnigliss spray or other spray containing Molykote
Barrierta L55/1 grease
Make a few switching operations after the termination of maintenance works.
Specifications are subject to change without notice.
DRIBO 01/2015
7